Enhanced CTorrent Code

Better timing for closing files opened in write mode

Remove bf file when -c is used.

Remove bf file when -c is used.

Set errno in low-level btfiles functions to facilitate better error messages.

Set errno in low-level btfiles functions to facilitate better error messages.

Correct some CTCS error handling

Correct some CTCS error handling

Set ENOMEM on alloc failure in truncate routine

Set ENOMEM on alloc failure in truncate routine

Correction in RandBits